public static byte[] PolyStairDeCrypt(byte[] Data, string key)
{
byte[] Key = System.Text.Encoding.ASCII.GetBytes(key);
for (int i = 0; i <= Data.Length; i++)
{
Data[i % Data.Length] = Convert.ToByte((Convert.ToInt32(Data[i % Data.Length] ^ Key[i % Key.Length]) - Convert.ToInt32(Data[(i + 1) % Data.Length]) + 256) % 256);
}
Array.Resize(ref Data, Data.Length - 1);
return Data;
}